Rolling mill



| lVERSEN ROLLING MILL 2 Sheets-Sheet Filed July 10 Sept; 23, 1930.

- L. IVERSEN' ROLLING MILL Filed July 10 1926 2 Sheets-Sheet 2 INVENTOR Patented Sept. 1930 UNITED STATES PATENT OFFICE LORENZ IVERSEN, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR '10 MESTA MACHINE COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA ROLLING MILL I Application filed July '10,

The present invention relates broadly to v the art of metal rolling, and more particularly to improvements in rolling mills, and especially rolling mills of the character usually designated as four-high mills, and to cluster mills.

At the present time it iscustomary in the art to which this invention relates to construct four-high mills in which both the smaller intermediate rolls are driven as well as the lower roll. .For the purpose of driving the lower roll it is customary to provide a special pinion inthe gear housing and connect the; same with the lower roll through a slip or riction drive. It will beapparent that such a construction not only increases the cost ofthe installation but also the expense of upkeep. The slip driving connection is also objectionable from the standpoint of difficulty in adjustment for satisfactory op: eration..

- The present invention has for one of its 1 objects the provision of an improved mill of such'nature that the rotation of the lower roll of a four-high mill or the rotation of the lower rolls'ofa cluster mill is insured without the PI'OVlSlOIl of any special driving means therefor.

' Another object of the present invention is to provide a rolling mill having improved means for balancing the upper rolls, the construction preferably being such that the Weight of all of the upper rolls is transmitted directly to the lower roll or rolls for improving the frictional drive of such lower roll or rolls. a

In the accompanying drawings I have shown more or less diagrammatically, for purposes of illustration only, a preferred em bodiment of the present invention, it being understood that the drawings do not define the'limits of my invention as changesin the construction and operation disclosed therein may be made without departing either from. the spirit of the invention or the scope of my broader claims.

In thedrawings,

Figure 1 is an end elevational View, partly broken away, illustrating one form of mill embodying the present invention,

1926. Serial No. 121,614.

Figure 2 is a vertical sectional view along the line'II-II of Figure 1, certain of the parts being shown in elevation for the sake of clearness, and

Figure 3 is a diagrammatic view showing .a cluster mill.

In carrying out the present invention there may be provided a mill housing 2 of any desired construction having windows 3 therein through which may extend the necks 4 of the upper and lower or backing rolls and the necks 5 of the intermediate or working rolls. For driving the working rolls there is shown a pinion housing 6 having pinions 7 therein adapted to drive the spindles 8 connelcted in known manner to the intermediate r0 ls.

It is obviously desirable in mills of the four-high type to insure continuous rotation of the lower backing roll at all times while the mill is in'operation. Heretofore, such rotation has been obtained by reason of a speproved mounting of the rolls in such manner that the weight of at least two, and preferably of all of the top three rolls, is transmit- .ted directly to the lower roll for insuring such a frictional contact therewith that the lower roll will be continuously driven by friction during the operation of the mill.

The desired results herein contemplated may be obtained by providing at each end of the housing a special yoke for the working rolls, each of which yokes comprises a lower section 9 and an upper section 10. Each of these sections carries one-0f the working rolls, and the desired balancing action is obtained by providing the lower section with holders 11, preferably of generally cylindrical cross-section adapted to receive compression springs 12. These springs at their lower ends bear agalnst the bottoms of the holders and at their upper ends contact with followers 13 engaged by adjusting screws 14. Each of the adjusting screws may be located in position in any desiredmanner, as for example, by a lock nut 15, whereby any desired initial compression maybe exerted on the springs for thereby insuring the proper balancing arrangement, the weight of the top one of the working rolls is likewise transmitted to the 4 lower rolls Lateral movement of the yoke sections either transversely with respect to the housings or outwardly with respect theretomay be prevented .by suitableguidin'g clamps 16'..'

The, upper mounted at its opposite backing roll is Conveniently ends in bearings 17 -having slots 18 accommodating holding bolts construction of the screw insure ofthe working rolls w in such case 19 whereby the top'roll may be vertically adjusted at will by suitable screw down'mechanism down mechanism and of the-bearing 17, is such that theweight of the upper roll is also carried by the inter: mediate rolls and in turn through them by the lower roll. ,With such an arrangement the weight of the upper rolls is sufiicient to rictional contact between the bottom intermediate roll and the lower roll of such nature that continuous rotation of the lower roll is insured. .This constitutes one of the advantages of the present invention.

As illustrated in Figure 3 the invention is also applicable to a cluster mill, the weight I i g transmitted to the two bottom backing rolls 6 for insuring rotation thereof by friction. A further advantage of the present tion arises from .the provision of'a yok eof weight of this bottom ing rolls, the lower 20as well understood in the art. The,

vcarried by said yoke,

' ing means to the mg roll to'the lower working roll.

3. In a mill, at least one lower u'ndriven backing roll, at least one upper backing roll, upper and lower working rolls intermediate the backing rolls, means for driving the workthe upper working roll and the upper backthe lower working roll, yoke portions carriedon the necks of the lower working roll, yoke portions carried on the necks of the upper working roll, spring means interposed between the yoke portions, and'means for adjusting the spring pressure.

4. In a mill, intermediate rolls, a yoke common to said rolls, and roll balancing means I carried by-said yoke, said roll balancingmeans comprising a spring and meansfonadjusti g the pressure thereof.

5. In a mill, intermediate rolls, a yoke common to saidrolls, and roll balancing means means comprising a plurality of springs, each provided with means for adjustingthe spring pressure.

' 6. In a mill, a'mill housing, a lower backing means in said housing, intermediate rolls, upper backing means, and yielding means tending to separate the intermediate rolls,

the last mentioned means being effective for transmitting the weight of the upper backlower backing means.

backing roll supporting said roll balancing In testimony whereof I have hereunto set my'hand. If; LORENZ IVERSEN.

inven such nature that the weightof at least the two intermediate rolls,

- intermediate rolls and of the upper roll may rolls. Still further advantages of means,

be transmitted directly to the lower roll or spring, so mounted that-the thrust exerted in the balancing action is transmitted directly to the lower-roll or rolls and not to the mill housing as has heretofore been customary.

I claim: I

'1. In a mill, upper and lower backingintermediate rolls, for supporting one weight of the upper backing means to the lower backing means. I

2. In a. mill, at least one lower undriven backing roll, at least one upper backing roll, upper and lower working rolls intermediate the backing rolls, means for driving the working rolls, the lower backing roll supporting the lower working roll, and spring means connecting the upper and lower working rolls and-effective for transmitting the weight of and preferably of the two and spring means ofthe intermediate rolls from the other and'for transmitting the 

